Question

If a coin is tossed two times what is probability..... (1)Getting head at least once.. (2)Getting exactly one head

Answer 1

Sample space S = {HH, HT, TH, TT}
i.e. total number of cases = 4
(1) Favourable cases for atleast one head are {HH, HT, TH}. Required probability = 3/ 4
(2)Favourable cases for exactly one head are {HT,TH} . Required probability = 2/4 = 1/2